02327nas a2200253 4500008004100000022001400041245006700055210006700122260007100189300001400260490000600274520150100280653001601781653001601797653002301813653001701836653001401853100001701867700003201884700002401916700001301940700002201953856009801975 2016 eng d a2168-048500aGreen approach to dye wastewater treatment using biocoagulants0 aGreen approach to dye wastewater treatment using biocoagulants a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY a2495-25070 v43 a

The present study focuses on newer biocoagulants, bioformulations, and the understanding of coagulant behavior with biocoagulants in relation to chemical coagulants. Newer biocoagulants, seeds of Azadirachta indica (AI) and pads of Acanthocereus tetragonus, are discussed along with two known biocoagulants, Moringa oleifera and Cicer arietinum seeds. Dye removal studies were carried out using widely reported Congo red dye to facilitate easy comparison with other conventional coagulants and the effect of various parameters such as initial dye concentration, pH, coagulant dose, etc. are discussed in detail. The use of biocoagulant was found to be highly effective, and up to 99% dye removal was achieved for coagulant doses in the range of 300-1500 mg/L. It was also observed that coagulation is pH sensitive, similar to chemical coagulants. Although the biocoagulant dose is relatively higher than the conventional chemical coagulants, a good value for the sludge volume index, similar to 50 mL/g for 1 h and 30 min, respectively, was obtained for the two coagulants, Acanthocereus tetragonus and Moringa oleifera. A very high particle count compared to chemical coagulants was observed using a focused beam reflectance measurement. Bioformulation with chemical coagulants such as alum, ferric, and aluminum based coagulants can, not only lower doses of biocoagulants (up to one-third) but can also result in significant improvement in the coagulation performance, up to 50% or more.

10acoagulation10adye removal10aEffluent treatment10aflocculation10apollution1 aChethana, M.1 aSorokhaibam, Laxmi, Gayatri1 aBhandari, Vinay, M.1 aRaja, S.1 aRanade, Vivek, V. uhttp://library.ncl.res.in/content/green-approach-dye-wastewater-treatment-using-biocoagulants02347nas a2200253 4500008004100000022001400041245006200055210006200117260000800179300001200187490000700199520157700206653002301783653001301806653001401819653001701833653001501850100002801865700002401893700003201917700002601949700002201975856009601997 2018 eng d a1944-744200aSolvent degradation studies using hydrodynamic cavitation0 aSolvent degradation studies using hydrodynamic cavitation cJAN a295-3040 v373 a

Hydrodynamic cavitation for the degradation of organic solvents was investigated in detail using a newer form of cavitating device-vortex diode. The results were also compared with that using conventional cavitating device orifice. Removal of three different organic solventsacetone, methyl ethyl ketone (MEK), and toluene were studied on a pilot plant with capacity of 1m(3)/h. The effect of different operating parameters such as inlet pressure, initial concentration, and reactor type on the degradation rate of solvent was investigated in detail. The results revealed that efficiency of solvent removal varies substantially with the change in physical operating conditions and nature of the solvent. It was found that up to 80% degradation could be achieved for toluene (cavitational yield 32.2 x 10(-3) mg/J), substantially higher than that for acetone and MEK indicating the effect of molecular weight/structure in the degradation process. Further, the results clearly indicated chemical oxidation as a predominant mechanism for degradation and not physical destruction. Vortex diode that works on the principle of vortex generation for cavitation, was found to be far superior over conventional cavitating device-orifice- approximate to up to eight times higher cavitational yield could be obtained for toluene as compared to orifice. The results of this study provide newer insight into solvent removal using hydrodynamic cavitation and would have bearing on the treatment of solvent containing wastewaters. (C) 2017 American Institute of Chemical Engineers

10aEffluent treatment10aindustry10apollution10aVortex diode10awastewater1 aSuryawanshi, Pravin, G.1 aBhandari, Vinay, M.1 aSorokhaibam, Laxmi, Gayatri1 aRuparelia, Jayesh, P.1 aRanade, Vivek, V. uhttp://library.ncl.res.in/content/solvent-degradation-studies-using-hydrodynamic-cavitation02646nas a2200265 4500008004100000022001400041245012000055210006900175260000900244300001200253490000800265520177000273653001502043653001702058653001302075653001402088653002502102100001602127700002402143700002102167700002202188700002202210700002502232856012302257 2019 eng d a0301-479700aHydrodynamic cavitation using vortex diode: an efficient approach for elimination of pathogenic bacteria from water0 aHydrodynamic cavitation using vortex diode an efficient approach cJUL  a210-2190 v2423 a

The present study successfully demonstrates greener methodology of hydrodynamic cavitation using rotational flows for disinfection of water. Disinfection of two model microbial strains-gram-negative (Escherichia colt) and gram-positive (Staphylococcus aureus) using vortex diode was evaluated. The removal efficacy was quantified for two different cavitation reactors. Practically complete elimination of E. coli was achieved (99%) after 1 h of cavitation at a pressure drop of only 0.5 bar. However, elimination of S. aureus using vortex diode was observed to be lower in comparison to the removal of E. coli and only 60% disinfection could be achieved under similar conditions, which can be subsequently enhanced up to 98% by increasing pressure drop. The results were compared with another cavitating device that employs linear flow for cavitation, orifice. The reactor geometry has significant impact on the disinfection process and orifice was found to require significantly higher pressure drop (10 bar) conditions for disinfection and for eliminating grain-positive bacteria with high efficiency. A plausible mechanism for disinfection was proposed to elucidate the role of cavitation in cell destruction leading to death of cells through the rupture of cell wall, oxidative damage and possible DNA denaturation. Also, a cavitation model using per pass disinfection was developed that can provide meaningful physical description of the disinfection process as against the conventional first order reaction rate model. This study would provide meaningful insight into cavitation process based on hydrodynamic cavitation for the destruction of both gram-negative and gram-positive bacteria from various water sources, including industrial wastewaters.

10aCavitation10aDisinfection10akinetics10apollution10aWastewater treatment1 aJain, Pooja1 aBhandari, Vinay, M.1 aBalapure, Kshama1 aJena, Jyotsnarani1 aRanade, Vivek, V.1 aKilledar, Deepak, J. uhttp://library.ncl.res.in/content/hydrodynamic-cavitation-using-vortex-diode-efficient-approach-elimination-pathogenic02682nas a2200229 4500008004100000022001400041245010700055210006900162260000800231300001100239490000700250520191300257653001702170653001502187653001402202653001402216653002502230100002202255700002402277700002202301856012902323 2021 eng d a1350-417700aImproving efficiency for removal of ammoniacal nitrogen from wastewaters using hydrodynamic cavitation0 aImproving efficiency for removal of ammoniacal nitrogen from was cJAN a1053060 v703 a

The present study reports significant improvements in the removal of ammoniacal nitrogen from wastewater which is an important problem for many industries such as dyes and pigment, distilleries and fisheries. Pilot plant studies (capacity, 1 m(3)/h) on synthetic wastewater using 4-amino phenol as model nitrogen containing organic compound and two real industrial effluents of high ammoniacal nitrogen content were carried out using hydrodynamic cavitation. Two reactor geometries were evaluated for increased efficiency in removal-orifice and vortex diode. Effect of initial concentration (100-500 mg/L), effect of pressure drop (0.5-5 bar) and nature of cavitating device (linear and vortex flow for cavitation) were evaluated along with effect of salt content, effect of hydrogen peroxide addition and aeration. Initial concentration was found to have significant impact on the extent of removal: similar to 5 g/m(3) removal for initial concentration of 100 mg/L and up to 12 g/m(3) removal at high concentration of 500 mg/L. Interestingly, significant improvement of the order of magnitude (up to 8 times) in removal of ammoniacal nitrogen could be obtained by sparging air or oxygen in hydrodynamic cavitation and a very high removal of above 80% could be achieved. The removal of ammoniacal nitrogen by vortex diode was also found to be effective in the industrial wastewaters and results on two different effluent samples of distillery industry indicated up to 75% removal, though with longer time of treatment compared to that of synthetic wastewater. The developed methodology of hydrodynamic cavitation technology with aeration and vortex diode as a cavitating device was found to be highly effective for improving the efficiency of the conventional cavitation methods and hence can be highly useful in industrial wastewater treatment, specifically for the removal of ammoniacal nitrogen.

10aAmino phenol10aCavitation10aOxidation10apollution10aWastewater treatment1 aPatil, Pravin, B.1 aBhandari, Vinay, M.1 aRanade, Vivek, V. uhttp://library.ncl.res.in/content/improving-efficiency-removal-ammoniacal-nitrogen-wastewaters-using-hydrodynamic-cavitation02116nas a2200229 4500008004100000022001400041245011100055210006900166260000800235300001100243490000800254520135200262653001501614653001301629653002101642653001401663653001401677100002201691700002401713700002201737856012701759 2021 eng d a0255-270100aWastewater treatment and process intensification for degradation of solvents using hydrodynamic cavitation0 aWastewater treatment and process intensification for degradation cSEP a1084850 v1663 aIndustrial wastewater treatment for removal of small concentrations of harmful solvents is pertinent issue in many chemical and pharmaceutical industries. The present work evaluates removal of three common solvents by hydrodynamic cavitation (nominal capacity, 1m(3)/h). Solvent degradation of three solvents viz. octanol, dimethyl formamide and cyclohexanol was studied in the concentration range of 50-200 mg/L and for the pressure drop range of 0.5-5 bar. The vortex based cavitation device (vortex diode) was compared with that of linear flow based device (orifice). Process intensification in the form of aeration and addition oxidizing agent-hydrogen peroxide was also evaluated for synergistic effect. The vortex diode required lower pressure drop and is superior to orifice and process intensification using aeration is most effective. A reduction in TOC to the extent of 74% could be achieved for octanol (200 ppm) using aeration with cavitational yield of 1202x10(-4) mg/J for vortex diode, yield similar to 10 times of orifice. The degradation depends on the nature of solvent and it was revealed that low values of dielectric constant (epsilon<10) favour degradation. The kinetics was evaluated using rate model based on per-pass degradation factor. The process techno-economic feasibility is useful in industrial wastewater treatment.10aCavitation10aEffluent10aOrganics removal10aOxidation10apollution1 aPatil, Pravin, B.1 aBhandari, Vinay, M.1 aRanade, Vivek, V. uhttp://library.ncl.res.in/content/wastewater-treatment-and-process-intensification-degradation-solvents-using-hydrodynamic